JPH07330019A - Packing material - Google Patents

Abstract

PURPOSE:To provide a packing material which prevents ink from discoloring and improves the luster on the ink surface so as to widely apply the surface print in the packing field. CONSTITUTION:A packing material is printed on the surface of a plastic film with ink and further, coated with a transparent resin film. it is preferable to coat only the printed part with ink or the peripheral part thereof with the transparent resin film.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to packaging, and more particularly to applications in which currently printed packaging materials are used in the food packaging field.

[0002]

2. Description of the Related Art When a product is sold to consumers, a packaging material is used to protect the product from the outside, to enhance the design and value of the product, and to maintain the quality of the product. . At present, the number of plastic packaging materials is increasing in terms of price, function and productivity. Particularly in the food field, from the standpoint of consumer protection, multi-functional packaging materials are required under the conditions where the regulation of additives is becoming more strict and the preservation of freshness is required. For this reason, it is necessary to form various resins into multiple layers in the packaging material, and the number of processing steps required in the conventional dry laminating method and extrusion laminating method is large. Most of the packaging materials are usually printed,
Further, edible packaging materials are rarely printed directly on the surface in the past, and when multilayered, another film is laminated on the printed surface of the film so that the printed surface is on the inside. This has been carried out for the purpose of preventing the mixture of the ink into foods due to the falling off of the ink and improving the design problem that the surface of the printed ink is not glossy. The co-extrusion method is a method of laminating various resins in a sheet forming die in a molten state, and since it is impossible to print inside the film, when printing is necessary, other printed films are co-extruded. A method such as dry laminating on a multi-layer film is used. Depending on the application, it may be printed directly on the surface of the co-extruded film, but it is not expected to have the effect of increasing the commercial value only for the purpose of simply identifying the content in some business applications. In addition, laminating another film causes problems such as an increase in cost and a decrease in moldability of a conventional coextrusion film.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a packaging material that prevents ink from falling off and improves ink surface gloss so that surface printing, which is performed only in some fields, can be widely used in the packaging field. It is provided.

[0004]

The present invention is a packaging material characterized by printing an ink on the surface of a plastic film and further coating a transparent resin film thereon,
A plastic film is a coextruded multilayer film, and is a packaging material in which a transparent resin film is coated only on the ink printed portion and its periphery (hereinafter referred to as a partial top coat). The plastic film used in the present invention is various monolayer films and multilayer films used in the field of packaging, and it is a coextruded multilayer film that is expected to have the effect of the present invention. Further, as the ink, those currently used for various purposes are used. When printing the ink, the wettability may be improved by corona treatment or the like on the film surface in consideration of adhesion. The transparent resin film used in the present invention is a mixture of oils and fats, resins, auxiliary agents and the like having a composition other than the colorant used in the printing ink, and the type of each component can be changed depending on the application.

When coating a transparent resin film,
Depending on the application in the food field and the like, the odor of the residual solvent used in coating may be a problem, and in that case, partial topcoat is desirable. By coating a transparent resin film on the printed ink, it is possible to prevent the conventional ink from falling off, improve the lack of gloss on the ink surface, and enable packaging with high commercial value. Further, since the printed film is conventionally laminated, the cost may increase, and depending on the packaging form, deep drawing may not be possible due to deterioration of formability, but when printing directly on the film surface as in the present invention, Now printing films can be used for applications that are not possible.

[0006]

EXAMPLES Examples will be described below. Example 1 Coextruded 6-nylon / adhesive layer / LLD
PE (45μm / 15μm / 90μm Total thickness 150μ
The 6-nylon side surface of the three-layer film 1 of m) was subjected to corona discharge treatment, and four colors were printed by the gravure printing with the ink 2 whose main resin was vinyl chloride / vinyl acetate copolymer / urethane resin, and the main resin was printed thereon. Transparent coating agent 3 in which is the same vinyl chloride vinyl acetate copolymer / urethane resin as the ink
Was coated on the entire surface by gravure printing as shown in FIG. The above-mentioned printing film was pressure-molded in a vacuum packaging machine into a cylindrical shape having a depth of 20 mm and a diameter of 10 mmφ to evaluate the formability. Example 2 Co-extruded PET / adhesive layer / 6.66-nylon / ethylene / vinyl alcohol copolymer / adhesive layer / ethylene / vinyl acetate copolymer (18 μm / 6 μm /
18 μm / 12 μm / 6 μm / 60 μm Total thickness 120
(6 μm) of the 6-sided film 1 on the PET side is subjected to corona discharge treatment, 6 colors are printed by gravure printing with ink 2 whose main resin is an acrylic resin, and a transparent coating on which the main resin is the same acrylic resin as the ink Agent 3 was partially topcoated by gravure printing as shown in FIG. The print film was evaluated for moldability in the same manner as in Example 1.

(Comparative Example 1) A 6-nylon film having a thickness of 50 μm was subjected to corona discharge treatment, and the surface was subjected to 4-color gravure printing with the same ink as in Example 1, and a urethane resin adhesive was applied to the printed surface. Then, an LLDPE film having a thickness of 100 μm was dry laminated. The film was evaluated for moldability in the same manner as in Example 1. (Comparative Example 2) Six-color gravure printing was performed on a stretched PET film having a thickness of 20 μm with the same ink as in Example 2, and a four-layer coextrusion multilayer film (layer constitution was ethylene. Vinyl alcohol copolymer / 6
・ 66 nylon / adhesive layer / ethylene / vinyl acetate copolymer (1
5 μm / 15 μm / 10 μm / 65 μm) with a total thickness of 10
5 μm) was dry laminated. The film was evaluated for moldability in the same manner as in Example 1. Comparative Example 3 Coextruded 6-nylon / adhesive layer / LLD
PE (45μm / 15μm / 90μm Total thickness 150μ
The surface of 6-nylon side of the three-layer film of m) was subjected to corona discharge treatment, and four colors were printed by gravure printing with an ink whose main resin was vinyl chloride / vinyl acetate copolymer / urethane resin.
The film was evaluated for moldability in the same manner as in Example 1. The evaluation results of the above Examples and Comparative Examples are summarized in Table 1.

Table 1 Print surface gloss Moldability Abuse test Example 1 ○ ○ ○ Example 2 ○ ○ ○ Comparative example 1 ○ △ ○ Comparative example 2 ○ × ○ Comparative example 3 × ○ × Printing surface gloss ○: Gloss × : No luster (matting) Moldability ○: Molded on a cylinder △: Corner part cannot be molded ×: Almost no molding * Abuse test ○: Ink (or coating agent) does not drop ×: Ink drops Yes * Abuse test method: Knead the printed surface 10 times with both hands.

[0009]

According to the present invention, it becomes possible to provide a packaging material at a lower cost, even for applications where the conventional printing film produced by the laminating method could not be developed due to poor moldability and cost increase. The ever-increasing number of coextruded films can be used in a wider field.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in which a plastic film is ink-printed and a coating agent is partially top-coated.

FIG. 2 is a cross-sectional view in which a plastic film is ink-printed and then the entire surface is coated with a coating agent.

Claims (3)

[Claims] 1. A packaging material comprising a plastic film, the surface of which is printed with ink, and which is further coated with a transparent resin film. 2. The packaging material according to claim 1, wherein the plastic film is a coextruded multilayer film. 3. The packaging material according to claim 1, wherein a transparent resin film is coated only on the ink printed portion and its periphery.